A physician who gets an audit letter from a Medicare Advantage plan is dealing with the plan's own Special Investigations Unit (SIU), the internal fraud, waste, and abuse function CMS requires every plan to either run itself or fold into its compliance department, not a federal contractor. That distinction changes the procedure the provider is in: an SIU investigation moves through the plan's own contract, where payment suspension, recoupment, and network termination can land faster than the appeal structure a provider may know from traditional Medicare.
What a Plan's Special Investigations Unit Does
Every Medicare Advantage organization must run a compliance program that prevents, detects, and corrects fraud, waste, and abuse under its Part C contract. The HHS Office of Inspector General's Medicare Advantage compliance guidance describes the SIU as a unit tasked with detecting, investigating, and resolving claims of fraud, waste, or abuse, operating independently of the compliance department and running its own surveillance, interviews, and other investigative methods. The plan has to make the SIU reachable by phone, email, and other channels and accept anonymous reports, so an investigation can start from an enrollee complaint, a competitor tip, an employee report, or the plan's own claims analytics flagging a billing pattern.
How an SIU Differs From a MAC or UPIC
A Medicare Administrative Contractor (MAC) processes traditional fee-for-service Part A and Part B claims and runs medical review against a local coverage determination. A Unified Program Integrity Contractor (UPIC) is a separate federal contractor that investigates suspected fraud across the Medicare program and the Medicaid program, on CMS's behalf. A Medicare Advantage provider's claims sit outside both of those contractors' jurisdiction: the health plan adjudicates its own Part C claims and polices them with its own SIU. A plan may report suspected fraud to CMS's Medicare Drug Integrity Contractor (MEDIC) or to law enforcement, but that referral happens after the SIU has already opened its own file.
How a Plan Audit and Recoupment Actually Start
Once the SIU opens a file, the plan can request records directly from the practice and, where its network agreement with the provider allows it, apply extrapolation to a sample of claims to calculate a larger repayment amount. OIG's compliance guidance says that once a plan confirms a finding, it can respond by suspending payments to the provider, referring the matter to relevant agencies or law enforcement, or terminating the contract. A plan that identifies an overpayment can also seek recoupment of it. The dispute over that finding runs through the appeal procedure in the provider's own network agreement rather than through a Qualified Independent Contractor or an administrative law judge. A provider that assumes the traditional Medicare appeal ladder applies can miss the plan's own deadlines entirely.
A Medicare Advantage recoupment dispute is a contract dispute with the plan first, not an appeal to a federal administrative law judge.
Where CMS Oversight Enters
CMS enters through the compliance program it imposes on the plan and through audits of the plan itself. Under 42 C.F.R. 422.503, a Medicare Advantage organization must adopt an effective compliance program that includes measures to prevent, detect, and correct fraud, waste, and abuse, and if the plan discovers evidence of misconduct tied to payment or delivery of services, it must conduct a timely, reasonable inquiry into that conduct. CMS also audits the plan directly, apart from whatever the SIU is doing to a provider, through its own Risk Adjustment Data Validation program, which checks whether the diagnoses a plan submitted for risk adjustment are actually supported in enrollees' medical records and lets CMS collect overpayments from the plan when they are not. A provider's chart can end up reviewed twice for two different reasons: once by the plan's SIU looking at the provider's own billing, and again as the underlying documentation behind a CMS audit of the plan's risk adjustment submissions.
Why Early Legal Counsel Is Critical
It is critical that providers promptly retain experienced healthcare defense counsel upon receiving an SIU inquiry, a records request, a payment suspension notice, or any related Medicare Advantage plan correspondence. Early legal intervention can protect the provider's rights, ensure the response to the plan addresses the actual contractual and regulatory standard at issue, avoid inadvertent admissions, preserve relevant defenses, and allow counsel to communicate with the plan on the provider's behalf. Delaying legal representation can significantly affect the outcome of a matter and expose the provider to recoupment or network termination that a timely, well-documented response could have avoided.
How Health Law Alliance Can Help
Health Law Alliance represents physicians and other providers through Medicare Advantage plan SIU investigations, payment suspensions, recoupment demands, and network termination disputes, from the first records request through the plan's internal appeal.
Health Law Alliance's attorneys have overseen 2,000+ audits and handled 5,000+ matters, with 25+ years of experience.
If a Medicare Advantage plan has opened an SIU investigation or sent a payment suspension notice, contact Health Law Alliance's Medicare audit defense team for a free, confidential consultation before the plan's internal response deadline closes.
